function cu() {
  let d = new Date().getTime();
  return 'xxxxxxxx-xxxx-xxxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
    const r = (d + Math.random() * 16) % 16 | 0;
    d = Math.floor(d / 16);
    return Math.random() > 0.5 ? (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16) : (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16).toUpperCase();
  });
}

module.exports=cu;